66361919 has 8 divisors (see below), whose sum is σ = 71530032. Its totient is φ = 61202880.

The previous prime is 66361913. The next prime is 66361921. The reversal of 66361919 is 91916366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66361919 - 2⁸ = 66361663 is a prime.

It is a super-2 number, since 2×66361919² = 8807808586725122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66361913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26804 + ... + 29174.

It is an arithmetic number, because the mean of its divisors is an integer number (8941254).

Almost surely, 2^66361919 is an apocalyptic number.

66361919 is a deficient number, since it is larger than the sum of its proper divisors (5168113).

66361919 is a wasteful number, since it uses less digits than its factorization.

66361919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4537.

The product of its digits is 52488, while the sum is 41.

The square root of 66361919 is about 8146.2825264043. The cubic root of 66361919 is about 404.8613435829.

The spelling of 66361919 in words is "sixty-six million, three hundred sixty-one thousand, nine hundred nineteen".